import java.util.ArrayList;

public class WeatherData implements Subject{
    private ArrayList observers;
    private float temperature;
    private float humidity;
    private float pressure;

    public WeatherData(){
        observers = new ArrayList();
    }

    public void registerObserver(Observer o){
        observers.add(o);
    }

    public void removeObserver(Observer o){
        int i  = observers.indexOf(o);
        if (i > 0 ){
            observers.remove(i);
        }

    }

    public void notifyObservers(){
        for(int i = 0; i < observers.size(); i++){
            Observer observer = (Observer) observers.get(i);
            observer.update(temperature,humidity,pressure);
        }
    }

    public void measurementsChanged(){
        notifyObservers();
    }

    public void setMeasurements(float temperature,float humidity,float pressure){
        this.temperature = temperature;
        this.humidity = humidity;
        this.pressure = pressure;
        measurementsChanged();
    }
}
